Add 81/21 and 1/4
1st number: 3 18/21, 2nd number: 1/4
81/21 + 1/4 is 115/28.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 4 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 21 × 4 = 84,
81/21 = 81 × 4/21 × 4 = 324/84 - Likewise, for the 2nd fraction, since 4 × 21 = 84,
1/4 = 1 × 21/4 × 21 = 21/84 - Add the two like fractions:
324/84 + 21/84 = 324 + 21/84 = 345/84 - 345/84 simplified gives 115/28
- So, 81/21 + 1/4 = 115/28
In mixed form: 43/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/21+2/4 81/42+1/4 81/21+1/8 81/21+3/4 81/63+1/4 81/21+1/12 81/21+5/4 81/21+1/20 81/21+7/4 81/21+1/28